Hoisting attachment for ladders



M. BRANDEL HOISTING ATTACHMENT FOR LADDERS Filed Aug. 26, 1939 ATTORNEYSPatented Aug. 20, 1940 UNITED STATES PATENT QFFECE HOISTING ATTACHMENTFOR LADDERS Martin Brandel, Buffalo, N. Y.

Application August .26, 1939, Serial No. 292,086

' 3 Claims. (01. 24s 210) This invention relates to a hoistingattachthereon and adapted to carry the tackle whereby ment for ladderswhereby an ordinary ladder may the load is to be lifted. be convertedinto an apparatus for hoisting ma- In its preferred construction, thiscarriage terials such, for example, asroofing materials comprises aframe which includes upper and which are used in constructing orrepairing the lower metal cross bars I2, it which extend in '5 roofs ofhouses, although the same may also be spaced relation across the frontside of the ladder 'used advantageously for other purposes. and uprightmetal side bars Hi, M which con- It is the object of this invention toprovide nect corresponding ends of the cross bars and a hoistingattachment of this character which are preferably arranged in line withthe side in is very simple in construction and low in cost rails. Theconnection between the horizontal '10 and which can be readily appliedto ladders of and upright bars of the frame may be effected variouswidths and which can be readily adjusted either by rivets l5, as shownin the drawing, or with reference to the position of the load to be byother suitable means, such as electric welding.

lifted so that this can be done most efiiciently Means are provided forlocking this frame on M and with the greatest safety. different rungs ofthe ladder for the purpose of 15 In the accompanying drawing: holdingthe hoisting apparatus at different points Fig. 1 is a fragmentary frontelevation of a in the height of the same to suit the location ladderequipped with a hoisting attachment emwhere the work-is being done on abuilding. As

bodying this invention. shown in Figs. 1, 2 and 5, these locking meansFig. 2 is a vertical section taken on line 22, include two supportinghooks it which are 20 Fig. 1. mounted on the lower cross bar of thecarriage Fig. 3 is a horizontal section, on an enlarged and projectrearwardly and downwardly therescale, taken on line 33, Fig. 1. fromover one of the rungs of the ladder, as Fig. 4 isa fragmentary view ofthe adjusting shown in Fig. 2. mechanism showninFig. 3 but in adifferent posi-, In order to hold the lower part of the frame 5 tion.against horizontal movement on the ladder these Fig. 5 is a horizontalsection, on an enlarged supportinghooks [6 are engaged with the innerscale, taken on the correspondingly numbered line sides of the ladderrails l8 and to permit such in Fig. 1. Y hooks to be engaged with therails of different p Fig. 6 is a fragmentary front view of a hoistingladders having their rails spaced different dis- 30 attachment showing amodification of the means tances apart, means are provided for adjustingfor-holding the lifting mechanism in its adjusted these hookshorizontally on the frame. The

position, preferred means for effecting such adjustment Fig.1! is a topplan view of the construction of these hooks, as shown in Figs. 1 to 5,consist shown in 6. of a bracket arm ll projecting downwardly from 35 Inthe following description similar characters the front end of each hookand engaging with 1 of reference indicate like parts in the several thefront side of the lower frame cross bar I3, figures of the drawing: anda clamping bolt I8 passing through each This hoisting attachment may beused in conof these arms and through a horizontal slot 19 40 nectionwith ladders which vary in detail conin the adjacent part ofsaid lowercross bar. 40 struction and are made of various materials, Uponloosening the bolts t8 the hooks l6 may but the ladder shown in thedrawing as one suitbe slid horizontally the requisite extent for ablefor use in connection with this attachment engaging them with the innersides of the ladder comprises two upright side rails of wood which railsafter which these hooks may be held in are spaced apart and connected atsuitable inplace by tightening these bolts and thereby hold- 45 tervalsthroughout the height of the same by ing the lower part of the hoistingframe and means of horizontal rungs or rounds .H which the ladderagainst horizontal displacement relaare also made of wood. tive to eachother.

In its general organization, the hoisting The upper part of the hoistingframe is conattachment embodying this invention, comprises nected withthe rails of the ladder by means. 50 an upright carriage which isadapted to be slid which operateto guide this frame vertically onvertically on the ladder into the position best the ladder and also holdthe same against horisuited for handling the load which is to be lifted,zontal displacement relative to each other. The and a derrick pivotallymounted on the carriage preferred means for accomplishing this purpose'55 so as to be capable of swinging horizontally consist of two guidehooks 20 which engage with the rear and lateral sides of the ladderrails and are adjustably connected with the opposite ends of the upperframe cross bar I2 by means of clamping bolts 2| passing through abracket arm 22 of each guide hook and through a horizontal slot 23 inthe adjacent end portion of the upper frame cross bar I2, as best shownin Fig. 3. By these means these hooks not only serve as guides whichhold the frame against forward, backward and sidewise movement on theladder, but also permit of shifting these guide hooks relative to theframe in order to adapt the latter to rails of ladders which are spaceddifferent distances.

Owing to the adjustability of the supporting hooks and the guide hookson the lower and upper parts of the frame, this apparatus can be mountedon ladders which vary in width and thus renders the apparatus as a wholevery flexible and avoids the necessity of providing frames or carriagesof different widths to fit different widths of ladders.

The derrick whereby the hoisting tackle is mounted on this carriage maybe variously constructed, but in its preferred form the same isconstructed as follows:

The numeral 24 represents an upper hearing which forms part of a bracket25 secured to the rear side of the upper frame bar I2 by means of rivets26, as shown, or by electric welding. The numeral 21 represents a lowerbearing which forms part of a bracket 28 secured to the lower frame barI3 by rivets 29, as shown in Fig. 5, or other suitable fastening. Thetwo bearings 24, 21 project forwardly from their respective brackets andare connected with each other by means of a bearing tube 38 which alsooperates to stiffen the carriage as a whole, this tube being preferablyconnected with the upper and lower hearing by means of electric welding.

The numeral 3! represents an upright hoisting shaft or mast which isarranged in the upper and lower bearings 24 and 21 and in the bearingtube 30 and is capable of turning horizontally therein. Near its upperend this shaft is provided with a stop collar 32 which rests on theupper bearing so as to limit the downward movement of this shaft and atits lower end this shaft is provided with a cotter pin 33 adapted toengage with the underside of the lower bearing 21 and prevent the shaftfrom rising. At its upper end this shaft is provided with a laterallyprojecting horizontal arm or beam 34 which is preferably formedintegrally with the shaft 3! from a piece of round metal, such as iron.For the purpose of strengthening this derrick and holding the armreliably in position relative to the shaft, an inclined brace 35 isemployed which connects the central part of this arm with the shaftimmediately above its collar 32.

At its outer end the arm 34 is provided with a hook 36 which is adaptedto support the clevis 31 of the pulley or sheave 38 which together withthe rope 39 passing around the pulley form part of the tackle wherebythe load to be handled is raised-and lowered. By swinging this derrickabout the upright axis of the bearings on the carriage the tackle may beshifted horizontally for bringing the same into the position best suitedfor lifting the load.

Adjusting means are provided for retaining the derrick and the tacklemounted thereon in 2. definite position during the hoisting operationand thereby avoiding accidents while doing this work. The retainingmeans for this purpose shown in Figs. 1, 2, 3 and 4 are constructed asfollows:

The numeral 40 represents a horizontal retaining plate of metal which issecured to the shaft 3| and preferably forming part of the collar 32.

and provided in its curved outer edge with a segmental row of lockingnotches or recesses 4!, 42. On opposite sides of the shaft 3| two detentor locking catches or dogs 43 are pivotally mounted on the upper framebar l2 by means of rivets 44, or the like, so that either of thesecatchescan be engaged with and disengaged from the locking recesses ofthe plate 40. These locking recesses are arranged in a row and theendmost recesses 42 extend tangentially from the peripheral edge of theplate 42 inwardly, while the intermediate locking recesses 4| are madewide at their inner ends and narrow at their outer ends, as shown inFigs. 3 and 4.

By this means either one or the other of the catches 43 may be engagedwith the respective end recess or notch 42 at one end of the segmentalrow for holding the arm or beam of the derrick in one extreme of itshorizontally turned position and it is also possible for either of thecatches to engage one or another of the intermediate locking recesseswhich are of substantially keyhole or undercut formation so that whenone of these catches is swung into one of these'intermediate recesses,this catch will engage one of its sides with one side of this recessfrom the outer to the inner end thereof, while the opposite side of thecatch will only engage its outer part with the outer part of theopposite side of this recess, as shown in Figs. 3 and 4.

By this means the rotatable shaft and arm together with the loadconnected therewith by means of the tackle may be reliably held in anyposition with reference to the axis of the derrick and thus permit oflifting the load with the greatest safety.

In the preferred construction of this hoisting.

attachment the bracket bearings 24, 21 and this bearing tube 30 formingthe bearing in which the shaft or mast 3| is journaled are arranged onthe carriage midway of its opposite vertical edges and the upper end ofthis shaft is extended upwardly roof at the desired angle and thehoisting apparatus is attached to the uppermost part thereof so the arm34 can turn clear of the upper end of the ladder. The load is thenattached to the tackle which is mounted on the arm 34 while the latteris turned to the front side of the carriage and ladder.

After the load has been elevated to its highest position the shaft 3iand arm 34 are turned so that the arm swings from the front side of thecarriage and ladder over the upper ends of the same and then to the rearside thereof after which the load maybe deposited on the roof of thebuilding. The hoisting of the load from the ground to the roof cantherefore be effected easily, quickly, conveniently, safely andeconomically.

Instead of using the adjusting device for the derrick shown inFigs. 1,2, 3 and 4, the modified form of the same shown in Figs. 6 and 7 may beemployed. In this modified form the retaining plate 40 is providedadjacent to its outer curved edge 55 with a segmental row of openings 46one or the other of which is adapted to receive a retaining pin 41adapted to engage the front side of the upper frame cross bar l2 againstwhich it is held by the weight of the load onthe arm of the derrick andthereby Drevent displacement of this arm during the lifting operation.

As a'whole, this hoisting attachment. is very simple in construction andcapable of being produced at relatively low cost. The same is verycompact and therefore can be stowed away when not in use and alsocapable of being conveniently transported from one job to another. Forusing this hoisting attachment the same can be very quickly mounted onvarious sizes of ladders which may be available on a job and after beingerected this attachment together with the ladder forms a hoistingapparatus which permits of hoisting loads to and from thereof of abuilding or elsewhere with ease and facility and without endangering theoperators.

I claim as my invention:

1. A hoisting attachment for a ladder having upright side rails and aplurality of horizontal rungs connecting the side rails, said attachmentcomprising a carriage slidable vertically on said ladder andhaving-upper and lower cross bars and upright side bars connectingcorresponding ends of the horizontal bars, upper and lower bracketbearings arranged on the upper and lower bars, a bearing tubeconnecting, said bracket bearings, an upright shaft journaled in saidbracket bearings and bearing tube, a collar arranged on said shaft andresting on said upper bracket bearing, and an arm projecting laterallyfrom the upper end of said shaft.

2. A hoisting attachment for a ladder having upright side rails and aplurality of horizontal rungs connecting the side rails, said attachmentcomprising a carriage slidable vertically on said ladder, a shaftjournaled on said frame to turn horizontally and provided with asupporting arm, and adjusting means for holding said shaft and axis ofsaid shaft including a retaining plate '10 arm in different angularpositions relative to the mounted on said shaft and provided in its edgewith a segmental row of locking recesses each and adjusting means forholding said shaft and arm in different angular positions relative tothe axis of said shaft including a retainii r plate provided with asegmental row of ope and a retaining pin adapted to engage v 1 one oranother of said openings and to against said frame on either side ofsaid shaft.

MARTIN BRANDEL.

